MCQOPTIONS
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MCQOPTIONS
This section includes 143 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The property of fluid by virtue of which it offers resistance to shear is called |
| A. | surface tension |
| B. | adhesion |
| C. | cohesion |
| D. | viscosity |
| Answer» E. | |
| 2. |
Three capacitors each of the capacity C are given. The resultant capacity 2/3 C can be obtained by using them |
| A. | all in series |
| B. | all in parallel |
| C. | two in parallel and third in series with this combination |
| D. | two in series and third in parallel across this combination |
| Answer» D. two in series and third in parallel across this combination | |
| 3. |
"The total electric flux through any closed surface surrounding charges is equal to the amount oflcharge enclosed".The above statement is associated with |
| A. | Coulombs square law |
| B. | Gausss law |
| C. | Maxwells first law |
| D. | Maxwells second law |
| Answer» C. Maxwells first law | |
| 4. |
The dissipation factor of a good dielectric is of the order of |
| A. | 0.0002 |
| B. | 0.002 |
| C. | 0.02 |
| D. | 0.2 |
| Answer» B. 0.002 | |
| 5. |
If A.C. voltage is applied to capacitive circuit, the alternating current can flow in the circuit because |
| A. | varying voltage produces the charging and dicharging currents |
| B. | of high peak value |
| C. | charging current can flow |
| D. | discharge current can flow |
| Answer» B. of high peak value | |
| 6. |
Two plates of a parallel capacitor after being charged from a constant voltage source are separated apart by means of insulated handles, then the |
| A. | Voltage across the plates |
| B. | voltage across the plates decreases |
| C. | charge on the capacitor decreases |
| D. | charge on the capacitor increases |
| Answer» C. charge on the capacitor decreases | |
| 7. |
Which of the following is not a vector ? |
| A. | Linear momentum |
| B. | Angular momentum |
| C. | Electric field |
| D. | Electric potential |
| Answer» C. Electric field | |
| 8. |
The capacitance of a capacitor is not affected by |
| A. | distance between plates |
| B. | area of plates |
| C. | thickness of plates |
| D. | all of the above |
| Answer» D. all of the above | |
| 9. |
A dielectric material must be |
| A. | resistor |
| B. | insulator |
| C. | good conductor |
| D. | semi conductor |
| Answer» C. good conductor | |
| 10. |
If three 10 uF capacitors are connected in parallel, the net cararitance is |
| A. | 20 uF |
| B. | 30 uE |
| C. | 40 uF |
| D. | 50 uF |
| Answer» C. 40 uF | |
| 11. |
If three 15 uF capacitors are connected in series, the net capacitance is |
| A. | 5 uF |
| B. | 30 uF |
| C. | 45 uF |
| D. | 50 uF |
| Answer» B. 30 uF | |
| 12. |
The units of capacitance are |
| A. | volts/coulomb |
| B. | coulombs/volt |
| C. | ohms |
| D. | henry/Wb |
| Answer» C. ohms | |
| 13. |
For making a capacitor, it is better to select a dielectric having |
| A. | low permittivity |
| B. | high permittivity |
| C. | permittivity same as that of air |
| D. | permittivity slightly more than that of air |
| Answer» C. permittivity same as that of air | |
| 14. |
A capacitor stores 0.24 coulombs at 10 volts. Its capacitance is |
| A. | 0.024 F |
| B. | 0.12 F |
| C. | 0.6 F |
| D. | 0.8 F |
| Answer» B. 0.12 F | |
| 15. |
If the sheet of a bakelite is inserted between the of an , the capacitance will |
| A. | decrease |
| B. | increase |
| C. | remains unchanged |
| D. | become zero |
| Answer» C. remains unchanged | |
| 16. |
The ability of charged bodies to exert force on 6ne another is attributed to the existence of |
| A. | electrons |
| B. | protons |
| C. | neutrons |
| D. | electric field |
| Answer» E. | |
| 17. |
The electric field at a point situated at a distance d from straight charged conductor is |
| A. | proportional to d |
| B. | inversely proportional to d |
| C. | inversely proportional to d |
| D. | none of the above |
| Answer» C. inversely proportional to d | |
| 18. |
The electric field intensity at a point situated 4 metres from a point charge is 200 N/C. If the distance is reduced to 2 metres, the field intensity will be |
| A. | 400 N/C |
| B. | 600 N/C |
| C. | 800 N/C |
| D. | 1200 N/C |
| Answer» D. 1200 N/C | |
| 19. |
The force between two charges is 120 N. If the distance between the charges is doubled, the force will be |
| A. | 60 N |
| B. | 30 N |
| C. | 40 N |
| D. | 15 N |
| Answer» C. 40 N | |
| 20. |
One newton metre is same as |
| A. | one watt |
| B. | one joule |
| C. | five joules |
| D. | one joule second |
| Answer» C. five joules | |
| 21. |
Conductance : mho :: |
| A. | resistance : ohm |
| B. | capacitance : henry |
| C. | inductance : farad |
| D. | lumen : steradian |
| Answer» B. capacitance : henry | |
| 22. |
Which of the following can have negative temperature coefficient ? |
| A. | Compounds of silver |
| B. | Liquid metals |
| C. | Metallic alloys |
| D. | Electrolytes |
| Answer» E. | |
| 23. |
When a voltage of one volt is applied, a circuit allows one microampere current to flow through it.The conductance of the circuit is |
| A. | 1 n-mho |
| B. | 106 mho |
| C. | 1 milli-mho |
| D. | none of the above |
| Answer» B. 106 mho | |
| 24. |
If, R and t are the current, resistance and time respectively, then according to Joule's law heat produced will be proportional to |
| A. | I2Rt |
| B. | I2Rf |
| C. | I2R2t |
| D. | I2R2t* |
| Answer» B. I2Rf | |
| 25. |
A thermistor has |
| A. | positive temperature coefficient |
| B. | negative temperature coefficient |
| C. | zero temperature coefficient |
| D. | variable temperature coefficient |
| Answer» D. variable temperature coefficient | |
| 26. |
With three resistances connected in parallel, if each dissipates 20 W the total power supplied by the voltage source equals |
| A. | 10 W |
| B. | 20 W |
| C. | 40 W |
| D. | 60 W |
| Answer» E. | |
| 27. |
The number of electrons in the outer most orbit of carbon atom is |
| A. | 3 |
| B. | 4 |
| C. | 6 |
| D. | 7 |
| Answer» C. 6 | |
| 28. |
The ratio of mass of proton to that of electron is nearly |
| A. | 1840 |
| B. | 1840 |
| C. | 30 |
| D. | 4 |
| Answer» B. 1840 | |
| 29. |
Voltage dependent resistors are usually made from |
| A. | charcoal |
| B. | copper |
| C. | nichrome |
| D. | graphite |
| Answer» D. graphite | |
| 30. |
All good conductors have high |
| A. | conductance |
| B. | resistance |
| C. | reluctance |
| D. | thermal conductivity |
| Answer» B. resistance | |
| 31. |
are the materials having electrical conductivity much less than most of the metals but much greater than that of typical insulators. |
| A. | Varistors |
| B. | Thermistor |
| C. | Semi-conductors |
| D. | Variable resistors |
| Answer» D. Variable resistors | |
| 32. |
An open resistor, when checked with an ohm-meter reads |
| A. | zero |
| B. | infinite |
| C. | high but within tolerance |
| D. | low but not zero |
| Answer» C. high but within tolerance | |
| 33. |
A rheostat differs from potentiometer in the respect that it |
| A. | has lower wantage rating |
| B. | has higher wattage rating |
| C. | has large number of turns |
| D. | offers large number of tappings |
| Answer» C. has large number of turns | |
| 34. |
Which of the following statement is correct ? |
| A. | A semi-conductor is a material whose conductivity is same as between that of a conductor and an insulator |
| B. | A semi-conductor is a material which has conductivity having average value of conductivity of metal and insulator |
| C. | A semi-conductor is one which conducts only half of the applied voltage |
| D. | A semi-conductor is a material made of alternate layers of conducting material and insulator |
| Answer» B. A semi-conductor is a material which has conductivity having average value of conductivity of metal and insulator | |
| 35. |
The condition for the validity under Ohm's law is that |
| A. | resistance must be uniform |
| B. | current should be proportional to the size of the resistance |
| C. | resistance must be wire wound type |
| D. | temperature at positive end should be more than the temperature at negative end |
| Answer» B. current should be proportional to the size of the resistance | |
| 36. |
When current flows through heater coil it glows but supply wiring does not glow because |
| A. | current through supply line flows at slower speed |
| B. | supply wiring is covered with insulation layer |
| C. | resistance of heater coil is more than the supply wires |
| D. | supply wires are made of superior material |
| Answer» D. supply wires are made of superior material | |
| 37. |
Which of the following materials has the least resistivity ? |
| A. | Zinc |
| B. | Lead |
| C. | Mercury |
| D. | Copper |
| Answer» E. | |
| 38. |
Temperature co-efficient of resistance is expressed in terms of |
| A. | ohms/°C |
| B. | mhos/ohm°C |
| C. | ohms/ohm°C |
| D. | mhos/°C |
| Answer» D. mhos/°C | |
| 39. |
A nichrome wire used as a heater coil has the resistance of 2 £2/m. For a heater of 1 kW at 200 V, the length of wire required will be |
| A. | 80 m |
| B. | 60 m |
| C. | 40 m |
| D. | 20 m |
| Answer» B. 60 m | |
| 40. |
Two copper conductors have equal length. The cross-sectional area of one conductor is four times that of the other. If the conductor having smaller cross-sectional area has a resistance of 40 ohms the resistance of other conductor will be |
| A. | 160 ohms |
| B. | 80 ohms |
| C. | 20 ohms |
| D. | 10 ohms |
| Answer» E. | |
| 41. |
. 3 6 ohm resistors are connected to form a triangle. What is the resistance between any two corners |
| A. | 3/2 Q |
| B. | 6 Q |
| C. | 4 Q |
| D. | 8/3 Q |
| Answer» D. 8/3 Q | |
| 42. |
Which method can be used for absolute measurement of resistances ? |
| A. | Lorentz method |
| B. | Releigh method |
| C. | Ohms law method |
| D. | Wheatstone bridge method |
| Answer» E. | |
| 43. |
Three identical resistors are first connected in parallel and then in series. The resultant resistance of the first combination to the second will be |
| A. | 9 times |
| B. | 1/9 times |
| C. | 1/3 times |
| D. | 3 times |
| Answer» C. 1/3 times | |
| 44. |
A substance whose molecules consist of dissimilar atoms is called |
| A. | semi-conductor |
| B. | super-conducto |
| C. | compound |
| D. | insulator |
| Answer» D. insulator | |
| 45. |
A field of force can exist only between |
| A. | two molecules |
| B. | two ions |
| C. | two atoms |
| D. | two metal particles |
| Answer» C. two atoms | |
| 46. |
When resistance element of a heater fuses and then we reconnect it after removing a portion of it, the power of the heater will |
| A. | decrease |
| B. | increase |
| C. | remain constant |
| D. | none of the above |
| Answer» C. remain constant | |
| 47. |
Copper wire of certain length and resistance is drawn out to three times its length without change in volume, the new resistance of wire becomes |
| A. | 1/9 times |
| B. | 3 times |
| C. | 9 times |
| D. | unchanged |
| Answer» D. unchanged | |
| 48. |
Sparking occurs when a load is switched off because the circuit has high |
| A. | resistance |
| B. | inductance |
| C. | capacitance |
| D. | impedance |
| Answer» C. capacitance | |
| 49. |
Switching of a lamp in house produces noise in the radio. This is because switching operation produces |
| A. | arcs across separating contacts |
| B. | mechanical noise of high intensity |
| C. | both mechanical noise and arc between contacts |
| D. | none of the above |
| Answer» B. mechanical noise of high intensity | |
| 50. |
For testing appliances, the wattage of test lamp should be |
| A. | very low |
| B. | low |
| C. | high |
| D. | any value |
| Answer» D. any value | |